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| Two-vibron bound states in the β--Fermi--Pasta--Ulam model | |
| 引用本文： | 胡新广,唐 翌. Two-vibron bound states in the β--Fermi--Pasta--Ulam model[J]. 中国物理 B, 2008, 17(11): 4268-4272 |
| 作者姓名： | 胡新广 唐 翌 |
| 作者单位： | Department of Physics, Xiangtan University, Xiangtan 411105, China;Department of Physics, Xiangtan University, Xiangtan 411105, China |
| 基金项目： | Project supported by the KeyProject of Hunan Provincial Educational Department of China (GrantNo 04A058). |
| 摘 要： | This paper studies the two-vibron bound states in the β- Fermi Pasta-Ulam model by means of the number conserving approximation combined with the number state method. The results indicate that on-site, adjacent-site and mixed two-vibron bound states may exist in the model. Specially, wave number has a significant effect on such bound states, which may be considered as the quantum effects of the localized states in quantum systems. |
| 关 键 词： | Fermi-Pasta-Ulam模型 数字状态法 维布隆振动电容器 界态 |
| 收稿时间： | 2008-02-14 |
Two-vibron bound states in the β--Fermi--Pasta--Ulam model |
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| Hu Xin-Guang and Tang Yi. Two-vibron bound states in the β--Fermi--Pasta--Ulam model[J]. Chinese Physics B, 2008, 17(11): 4268-4272 | |
| Authors: | Hu Xin-Guang and Tang Yi |
| Affiliation: | Department of Physics, Xiangtan University, Xiangtan 411105, China |
| Abstract: | This paper studies the two-vibron bound states in the $beta$--Fermi--Pasta--Ulam model by means of the number conservingapproximation combined with the number state method. The resultsindicate that on-site, adjacent-site and mixed two-vibron boundstates may exist in the model. Specially, wave number has asignificant effect on such bound states, which may be considered asthe quantum effects of the localized states in quantum systems. |
| Keywords: | discrete breathers Fermi--Pasta--Ulam model number state method two-vibron boundstates |
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